Adding vhosts by creating a file?

I could swear I read somewhere that with the 4.0 release you could add vhosts to templates by creating a file on the filesystem - but I can't find it again or any other details about it.

Have I lost my mind, or has this been implemented? I've been writing my own control panel for my non profit - and have left the addon domain till last in the hopes that I'd be ready to upgrade to 4.0 about the time I started work on it.

If this has been implemented can you provide me a link to some additional documentation? Will a reload be required to activate the new vhosts? If so, is there any way to reload that by an unprivledged user?

Or you could cron a script that checks for the existence of a file (i.e. 'request_lsws_restart') in users home directories and restarts lsws and deletes the file if present (make sure it is a file! otherwise an user could make it a symlink to /etc/passwd ).